Techniques for Generating Silver Iodide Smoke.

摘要

It has been observed in the laboratory that silver iodide particles serve as nuclei for the formation of ice crystals. It is believed that silver iodide smoke particles are very good nuclei for ice formation because of the close similarity between the crystal structure of ice and silver iodide. Trillat and Laloeuf have recently reported the results of electron diffraction studies of silver iodide smokes. They have found that all of the silver iodide smokes they examined contain the hexagonal form of silver iodide which closely resembles ice. The fact that silver iodide particles serve as nuclei for the formation of snow crystals has suggested the possibility that under the proper conditions clouds might be modified by the introduction of large numbers of silver iodide particles into the atmosphere, either from the ground or from an airplane. Inasmuch as silver iodide particles should not melt or rapidly evaporate under atmospheric conditions, it is not necessary to introduce them directly into a cloud.